Abstract: A superconducting quantum interferometric device (SQUID) includes: a conductive material region formed on a partial region of a substrate; a first superconducting material layer including a first loop including first and second extension units that are spaced apart from each other to form a proximity Josephson junction and that form a stack structure with the conductive material region; a second superconducting material layer including a second loop including first and second end units spaced apart from each other; and a tunnel Josephson junction formed by a stack structure including a tunnel thin film layer forming and the first and second end units, wherein at least a portion of the second loop forms a stack structure with the first loop.

Abstract: A Josephson junction device and a method of manufacturing the Josephson junction device are disclosed. The Josephson junction device includes a substrate having a top surface and a trench recessed below the first surface, wherein sidewalls of the substrate define sidewalls of the trench; a first superconducting electrode formed on the top surface of the substrate with sidewalls further defining the sidewalls of the trench; a tunneling thin film formed over the sidewalls of the substrate and over the sidewalls of the first superconducting electrode; and a second superconducting electrode formed in the trench in contact with the tunneling thin film and with top surface above the top surface of the substrate, wherein a superconducting tunnel junction is formed between the first superconducting electrode and the second superconducting electrode through the tunneling thin film.

Abstract: An active circulator includes: an active filter; and a power divider serially connected to the active filter, wherein three or more combinations of the active filter and the power divider are connected to form a loop.